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SUMMARY OF SIGNIFICANT EVENTS AND ACCOUNTING POLICIES - Recently Issued Accounting Pronouncements (Details) $ in Millions	Dec. 31, 2018 USD ($)
Non-cancelable leases and drilling contracts
Recently Issued Accounting Pronouncements
Contractual obligations related to non-cancelable leases and drilling contracts	$ 15.6

X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=hk_NonCancelableLeaseAndDrillingContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: